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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a459c836352232b1bb474a08f25cc2eb9c867df4c7e43b5219020300e7856b06' 
  AND token = 'Ww3vbAtbLzm20MlTHTilc1IymLlYQxbUDDh89BIQgtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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