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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '101e263d607993d0a87d828527b15a8230716de4618d1c20e94aa5eb765e5778' 
  AND token = 'aUgFJV1VVnwBh8gOTCderTnpQqU++0OPSN4sLNQyEOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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