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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a065e8b0338ccb755488b771d239d665fde63292480ce98489c3c4001d95e52' 
  AND token = 'xfboVcDVQtuJ+Y3k9A4TJ7ulnfuBI1wATlUj+Yog/a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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