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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e5e96f1c281992967d72d3fa2ff75c38e1a85f624c48764c11ea7afbb9ceb9f' 
  AND token = 'L7T6uoTw4NwqFlQtgTien5nrHN1oconaxta4V6dOIJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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