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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65a874b6a8dc7f337519e6fb150d8925effd1c8dc5343a805cd1193ee60182fe' 
  AND token = 'd49ulr/p4zL8ESS5c0dVFzoobiMUm+ntUHpfqe765Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00642

JSON explain

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