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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65d348d9a1adf5d4f975935a1066ab55eca35053396f78be35ace8ecc965887d' 
  AND token = 'lIb86w95tlzy+D62QNgfp/qmVDlj8l0gCLpBMOvdf2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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