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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d95e6189dc0ccffa7ae70c92a1b450c773e70876a9a4c7b136c7eab5fe2dc5' 
  AND token = 'V//pP1+xCXrqE17BEQl88aTXXj92I9+pdTcvgVPu5nM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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