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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '323de61ce102137af86842803d4d7ea8de3469ddb8f8b7ab4d64a40645565d4e' 
  AND token = 'MUkW/p/Sw6nS24qfQFNAZdIkreDPk0+zi5gBcQfW0BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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