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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cd8a4ca7a274c6527dd7d7eb9a30ff2c6dceae07735e59a538eca089232d79e' 
  AND token = '/WVSP4fdXCqcYTh9ekkPq3ry/h+o/C5eBJm2krj9Z/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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