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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f142336e41ab8b482390910d18a46b681fef963bc231adb3d57989a76e2cbe' 
  AND token = '1pZ71/HstFknC9h1EMFENVjsANRef+6bWhEfM5K5xBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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