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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a685b1eb9de1037913ebe74dff4260a672407019451fc439d4f8d92e72764993' 
  AND token = 'dpr3uJA0XIHBHTdTzQtAIX//O5jdwLS5ACw1ta2h9sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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