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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc7f7f99b3e07bcf8c68ee8fe2710847cd429a26af7bab32bb85c5ca9d5e7281' 
  AND token = 'Si1vUAPwQ3FaZUSkgkHBZn/kCe/U9OyGd4xcu1Wyn9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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