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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c38eb03340d016de116eed75b3f8c3ce249b940174c9e7281131ac745becba9e' 
  AND token = '4y5jrL5A5BnbjxABqu1m89AyWyxGaUCbkFoXbt5cL2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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