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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e2558830f513ec00d4c2fe3ba22c58812bac1b0d73c581244ce858a90d41bb' 
  AND token = 'Lbfci5PXiKnqhns+0qWMZGV7H1KsWVEBkKR5yS6SFx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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