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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38dee22da00c89e0d7b05a93c74bf079392fe31efb80405fef0038bec52cb7ac' 
  AND token = 'O1vKHqUz0iLfWcIn4yOyph9mm/QRv8zyBHuJwHtkVoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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