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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034e80e0ccacdf49a2529a8ae172e700dfd292b39a2b45a51391122191a1157a' 
  AND token = 'GvhUR4TFE/bkCMOTeLbu0wIT9tUo+SjA82b9naUWCOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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