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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a95841759691a212943b4e52bdf6b63297d71a10fcf9a9068fe242060e852d7f' 
  AND token = '0i+uAL19WiOsBgJ3O3mYrtgi0A5IaoFXnjQ1TZKyQPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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