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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25088ca17046fd5a1cf236446d59145f0fc3f56ada1843f6b0734e7e97eda6a0' 
  AND token = 'LheZRe/WXYaMDmD0J+lg4HwjZ39s/l8ng51BK86apd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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