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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '065762ec83316a2638d55ccee3c37e6f4fba197d32b65c93e82643f95ea7d83b' 
  AND token = 'mSW0zkuGLDvaUb4qXL3BbOAJcm9mQouxReaWbPjrRmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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