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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dab97fad7fbacdb6d5f768a22d120ae8fac00e34745b1cbc89aec23238ac8ded' 
  AND token = '9xApHtKaPnMqya1hBUwsktBCr/wpcdbFIyhhZW7t8w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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