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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd34cd08b8cba4d764752685763237c1f55b4f79da5b6840c2c75fa889db68851' 
  AND token = 'pQWhPDJhhyDn4tae1swcNiNTbncM8TAApQT1tIaC8tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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