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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46a4bbda5ab5567bf2187a9552700e68b50feffbd934be0b7e1e6a2506b9af38' 
  AND token = 'ct7oZw2ujMxFydnxU5grkgWlNU1lc3Gjx8zu9V3Fegg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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