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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb06a65106d73e3f211c3fd1f78dfa093811b6ff6c92ea637fcea8a6d79f5b6' 
  AND token = 'fqRDp+eGOw7gu585rCtS6/ZdwrSyvEiuC91K9u9hNFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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