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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be17e7684c10b84766301d6124d37937d3c1dfcf10eea1d172826474f4a24301' 
  AND token = 'kun9VX3ctjsiO2d8bYyJgenSkGVcxuZ1BLPUsAEpnA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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