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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e44eecb35ee59a11e0cac2b0e4f1f1fd6aec5d84e2a08ea29d1c49f66872c08' 
  AND token = 'J3OeFWiACxQyxfGY9dt07OZZwuo5hV+B152aXAytyEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00105

JSON explain

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