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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f937218b4f25d89eb8d86c0250ef77d4939aeedef193c8db2e40d991ed68d6' 
  AND token = 'mSL1QQaAYvr1t/cIiqwZ967b8Rz6eg7oAJYJCjn3Nqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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