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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cd704c2d3e99e8e4da682a1c4ec6aa40615af359af3e7e7847b7d39b461e099' 
  AND token = '0GtrNNGYPWA3oPY/Zo1t1LNzcxszGVc8OpYDFZLPHvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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