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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ad4f6a759e1162e4d45968a756df7089e5006336ec7c776cc7fc97a4ce4869' 
  AND token = 'tMqXtg92gCvnZ2PvsmOk4Ke1GLjB75jvtH54doWIHf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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