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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dbc688ec02467f50b1cf18b25cf99cd0b2a44c9e474761decfb1f9e0f43c121' 
  AND token = 'qghsyuYc1AUYbixerKAiKAhTMtAeoi/3kx5u2W8KNsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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