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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb35df06058118f21e6072359d8dca27993cc357a96c96d719b453d785d1a2da' 
  AND token = 'Nye9jlZa7XSiGkZ7NmCEPNinlPaniMcQ3ldyptA9N3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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