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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8142f773d774a959e727f5bb5790b98eb4e9d69ca8c32bef1def8e1b2dfc6e12' 
  AND token = 'dyFxVpXiQUq+Jr416xwtYvCX+YROxoti7KKo/4xdPiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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