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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8223279a486a8e80ce1ea427fc909b4a089b5f0f8641ba99d7a476354d86a0b' 
  AND token = '5GNYnryomgxLNZTtmb9VwR5wegUty3zH3vJ7N/if3EQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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