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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e6f660f382b1683cf636d00a7b32c4088d83e50e757121bdc1e0d679951726d' 
  AND token = 'AaE7H1AyJsOksF/nScJQnAVLn8YLZObNqn9KNzO2aCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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