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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb36020bde507686678d57ff5fad097fa6b4d1393637d11508fe7688cfe4bed' 
  AND token = 'lqkS2RzYOJwAVLcT5cWMI9bQ1SxBbqBbeo9BAPcL51o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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