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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3b83c9d04ae5b2276e5a939b7facdba075bbf29cbac88bce3b7defae2a76a74' 
  AND token = 'eBugKW+m4zrjOMxhffsOFQwmzOR9GJDS97Iv0t1Yxss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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