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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dca874aeda68ece78d1447463fe5cc333c8922d526139ca4724d1fd1936db070' 
  AND token = 'bMCUg8R0+P16a2zfx3j1BLfJrJqxGy6PYhl1GB933vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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