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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d03b88ba4ef37175a8bc27540890927d771b73835770671d1041db7c17a9e14' 
  AND token = 'ap1hqjcA+yAeKD9Ob6lqpKfD4x/c81XFdYoKDSg+tx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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