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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8702c04bcd7275f4a3f4964ef02c4e3417b7be2cf0005cc308fd20db856600eb' 
  AND token = 'BXCGg5QPWHp5qC0xo4N6XVKYlFaidDYrDI8MTkKJsOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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