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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa1e974a174baa8722ebc6ce9521339858fda428f6a50b8101917d31c856f05a' 
  AND token = 'kfJG6Dh8JiJetVdU1w7A008PanUuTp3wNA0jOTQn7gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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