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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e6cef36460ea461d1be5d9440b5c0014a6c180a9abd1cd7323ec39388f2ed3' 
  AND token = 'Q8njmtF/BbPa2TJEgbUGjh9Gs5xYEXtOhvWACDbF6vQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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