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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f67fd881ee0467c19f5b4a745b4b156c941e34e082bc5980f96ebaf28861be8' 
  AND token = 'lvCHhcqnmqhxY8tlU20/aJ1SMwMUQvj1Mtky4QWVsww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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