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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec710657d609c4cbe9b603b06008fc185188bd12d7310a8ece45bc580fb0a3c3' 
  AND token = 'UWV6sRQvayq6g5Ly1S9irNbcRUlTRRF7t0VsNPk4zzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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