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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04b42bc79197b87e2021cab8a9c0aa65ed855706a56c11fb6b12be83ffed764b' 
  AND token = 'q2YtSiSm9wl4e0ODR/HIK3ordR+ZOR5dBhb9SL8/XzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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