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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d19b992c20c833f84939c444d62c86936a79bf47eee8efbb12a1d9958ae88f5' 
  AND token = 'f+saUMHjHkj3n2HSdK2WmD5Ew7MuueVwmBtI/oZBko0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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