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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c006d04b645cf4b86daf1b59a9a7113d1b0a73febfd9272d26290af0c229b74' 
  AND token = 'voD3uPALBq9CabG0KQMq3ysW6T2mcZ50xW3+Uu9TKcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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