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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ae064ee3aeea261e2a908e9f200a8ec9157a581f8d06f1c75625febd79165a0' 
  AND token = 'qAt0e0hCT+qoiShJc1iXA3z049WunOTKZ6jr1uUw20o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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