SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '286fb03f7b09d4b4cc1e9b8da23beb72032bd6993d89ea60f5be313f8e67f96a' 
  AND token = 'LihMFfnMTjq5n/BPidBjRyn/QiCuzxsxr1lG/LMXOCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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