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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8824eb8c1d8f4f8c892bf294eb74ddb1aa4a7b964307e1a4abac2e069e1bc673' 
  AND token = '4oXwvB/i7pJth1Js0GTbP5KH3ln2nGNsAOfUbKEkwpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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