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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef9ef1fb4e645de71dfb1ac6a567f2c36227de1269b66ddbaefd1e2564ddcab8' 
  AND token = 'jNlAdarRaVth0FWoP5D/rQ3Dhc9XnPLDszBz+yjEL7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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