SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de885f18ad32629979d0d644f054d37fb8cca59c998825417c9030a5df378b1e' 
  AND token = 'ty9TsXiBp4hJD1qTP9/RUU0/K3wKZUOs7BFN5VQhZG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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