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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '881c902cc8d6dd897695cd0fc6af2a263e83c7f9ce209f8a9e8f86337ee5e3f8' 
  AND token = 'wwg2uI7tGCw5m/ytXp48NBxyuGupgAIR1A3RhjBB+nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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