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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb717e212208d6fbec7c4c481b475db56b1cbc5c7e06e733289210e428d417c7' 
  AND token = 'ki++ch/yj72KOykGlLAe6EVXlN1xwYI4UlWzoNn0HZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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