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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4baba7904fd2b335f55304ab55ee12c03dae9ffdef119a04ff42b948f873dea8' 
  AND token = '9uD1aDiAf/d5JshWRiT4tX644O4uzWEAKp1g0zO+lCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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