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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecfaf4ad9f34e3776cb6c1f5e859a37c497d36239fe86b108d308fb70f9a4a72' 
  AND token = 'X9QLw/n4uclkt6VyDgn5U/6aaMuJB7X/RVq+xf35+04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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