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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aab285a93818edb870ef4a290d0238d1a3b713ee883eca74d2f21c1dd130d05' 
  AND token = '7U/Dhjt8hkxljUo5EsYXCYMwilwLRc1MyDQYz9ZRGCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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