SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1295732517a35db86f19f0bab8be3081086b1f27b501ecc5df9c2c4d83031449' 
  AND token = '6zFNyRuOgJhGf7U3TqnBrjvTpuJ6q6yrOPufZU2OpfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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