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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760a63daf2659746016a2038efc285eeba5216752f7fcc9a3ee0cf256446da63' 
  AND token = 'RorbtzKn959k3Wg8j1qXXX8e9E96vdBMK42mS185i1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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