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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f22ba6f15b3b47f1099c66dee18a092732645a5a97d08dd7c832e8be2ac330bb' 
  AND token = 'gjhkjcOg0wdq3C8CWdNUEfxOMei55H+QgJBCv/evxqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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