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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f101bfcafb34c823a07b7727f3c2adea942209461381523c1af0003971cb641b' 
  AND token = '7cKUHnR7kamFrwcKfENm8AVw+snptb3cyS3AEUQWvk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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