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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '169f5588b19ea3aafc991033fcd6369534043361a9d458144f08ae42ca5787f8' 
  AND token = 'U75UgmkWow0lt+mU2UPgHMK64tEygYzL6TLUC4ilnXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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