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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07269a8f4e8f738f40bac11e586867bfda171277ff8a4af195c23c08c3c43a73' 
  AND token = 'mmw0a9CnVFr/bK11rEnNiTHr8LOERqMbcaLvgbVkH8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}