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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df7ea8dfb75cd3357a3f66efcd63f61dd411e2c71a58f3f5eff546b9476f39da' 
  AND token = 'anEiiBn47BqZ8ZGh+7KROu70h3QIk12neWLruo2Pvso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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