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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d516d15484fb6f21f8952a7b0fce201801322961a60622e362de098c2b28bed' 
  AND token = 'gONaQ29HwEfLrhGZQOyyiPSC69Rv4byTOpqcfKPALGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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