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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baf3c8789f6b0c5824cb47389d34a881ab93f44aaab55138ea2184a41c52b2f2' 
  AND token = 'oQVk1Q1M0nU71M+eXz3kQ2nWb1FdvjD3xCI/RVTnXkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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