Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '791ec1e8f305824b1947b90d097243a64132f790cd1a2d7efe1cdf8eb23eb567' 
  AND token = 'a3KERzLF1L3Pc8HHEc69auDqmlxhiFtu5V1az/v0UMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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