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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c14dde6c73b5f69a3c0d00db8e058f2ac089ea9af91718ea3e948397c0790a84' 
  AND token = 'SMGZFyxsEFLL/5CdLM+bORcOHrx7Ig4SiftQV308xrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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