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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c4e0a59448633198016fa1b4e16ca003aa2a6cc7b55b3a6e1705a676fcb4813' 
  AND token = '4roHC6kFhfEiBLsjl8srX+gOGsHvRaafAhtT73MZXyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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