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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cd02312ef28a8577c49ef0624f901fc7f452ad41bcbc05a6b2e6404d55e51d6' 
  AND token = 'QISn65WmOFXy5n8/NLsf0COI5PYlDpWUZMWkDvW4gyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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