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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a007be8263581c13b99843e8d0809a01adeadf9b1ad935f39456d3d709e3ea71' 
  AND token = 'uXwaR30nQB3EFnOIfBmBwnBF4uF/lNyi7k6mkHaNWVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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