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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085d5aa617d327372969cce5770d34751e2e09db574d7858a26da608258bc348' 
  AND token = 'QFtDFn1G8v3azfLg9U4xDnRfX6l44dKf4O9U1Sz16Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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