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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0cb40c6722c54ab5a63e52b68b23e95d8956807aab50c4aa6a8f2a6d1ac9da' 
  AND token = 'zNT3n7MxNb8bDyqg3QQHDuNg6iixVu5N/8DaEvQmzKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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