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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6be374dca96757b158510d06a8116e30180b77b77b05f1f647c0ec08a444c3b6' 
  AND token = 'y+Ffi5tu/d6vFOriyjjrqJtwMyiCVRke1IZXyUvYS0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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