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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cae937be05dbdbdd53f0521130a80d3447a77501fc0cbd8302610c30a85e66f7' 
  AND token = 'tl+P8e84lGzJ2jxw4+lfbnsQVdPDDlvH2vwHaKw045M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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