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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4d7a030e4a6868933af9a9cbd0e49c46f49b44d4653bc8d8c067532255fe99b' 
  AND token = 'ZxqwoLWolOP1LmsrSacuEzLq071Qo66WYD2aqcZwkbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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