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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e82d778636faedb30b2387d43c0f454fd0277134e3a8a09765cd059403a4f5f6' 
  AND token = 'xgx4xnkNVpg58zW6AtMHTbJZ0epO60d4X8h9c2gzIF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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