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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa9dab32b22b27ec4f87a37e2a36ec91222cce3c19ae3ba3d4171489fd09a1b' 
  AND token = '4gpcevhlIFlWf0z133Bq9RfcWOJeNGSXasQNstHpMMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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