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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '744a1ebff485f837561ff064801c7083a05752a3af6a41045389d4cfeae91837' 
  AND token = '6bcv3Pa41tc+1RnwjFxUBU3w85uZXgfhVc5r/t5+3Q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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