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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38525ab547e918c5c7d99715b863eac5b20fb93d5ef056c9d717ba632ad3c04b' 
  AND token = 'MRCTHcWWjcr96E2F9j1CVENKHRPiBkryOi/5xROR5ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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