SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa35b61e9fdd34470a52e8c88e4f52ec4f47c33641481f457a0635e3f47d82a' 
  AND token = '7ZjumqDhUMsMlglB+OzW2kwiAw8fdUVAJeeR94s/mPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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