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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669f7705347d5ddb45a59a174ddd0c8193eab79cd3fd6c1e8ebe8c475e5ea3cb' 
  AND token = 'OmCz3tso1SD1UaEoO5ywymrJ8rZ3Dq8l9rJ5Y08ykag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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