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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e48d0cc09f335d9a3dd281b8a7af24d0a6928ec52ae9f3a1ca0426d6e7099c6' 
  AND token = 'Wvfa3RppiEVvBCln/ywVz6NndedkJug5OMObE1TboqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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