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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5df042b9a7dee5cf2081ab1e99b6e5f5bb1782bd4a80d5d57508bf7f845d2e72' 
  AND token = 'sUo78uuQPqFFk9A4UCTLD/srn0/DJzhFwvRxwcRpR9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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