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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d5c59dd60f5572ceb731d7b1402a3a70b1c45f62de851492605c2e322bcab9' 
  AND token = 'Taz5Zcc1kumcnsvnuEa+pbsRHIVEruw6VZWsTuTkVpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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