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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a841fab054082259fef1f1d887ff6b5b315e99d52c9f0a664da0469a5134a589' 
  AND token = 'W2g5WNC9udntROYn8FX+9b9cIBjpGasNN+2WsDMHGx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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